Near-infrared surface photometry of 'Sixty Micron Peaker' galaxies

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Abstract
Near-infrared (NIR) photometry of a sample of 31 ‘warm’ IRAS galaxies whose spectral energy distribution peaks in the 60-μm band — Sixty Micron Peakers — is presented. Radial surface brightness profiles reveal that most are dominated by a bulge component in the NIR, indicative of early-type host galaxies. The distribution of the bulge effective radius in the K band is similar to LINERS and starbursts, but very different from optically selected Seyferts. The J, H and K host-galaxy colours, however, are not typical of normal early-type galaxies; they appear to contain significant dust and/or star formation. The sample galaxies classified as starbursts are well fitted by a single r1/4 profile and do not require a buried active nucleus, while most of the Seyfert galaxies do require an added nuclear point source to fit the light profile.J— K colour profiles and two-colour JHK diagrams reveal that the nuclei are quite red compared to the host galaxies, consistent with the picture of substantial centrally concentrated hot dust.

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